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Cation‐Exchange Characteristics of Sintered Hydroxyapatite in the Strongly Acidic Region
Author(s) -
Suzuki Suguru,
Fuzita Toshifumi,
Maruyama Toru,
Takahashi Minoru,
Hikichi Yasuo
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03957.x
Subject(s) - ion exchange , dissolution , chemistry , apatite , ion , cation exchange capacity , inorganic chemistry , mineralogy , nuclear chemistry , geology , organic chemistry , soil science , soil water
The ion‐exchange behavior of hydroxyapatite (Ca 10 (PO 4 ) 6 ‐OH) 2 ) (HAp), fired at high temperatures, has been investigated in the strongly acidic region (pH 2 and 3). According to the present study, HAp fired above 1000°C can exchange ions from Ca 2+ to Pb 2+ , even at pH 2, without dissolution. The molar ratios of Pb 2+ /Ca 2+ after ion exchange are approximately unity in all cases. Ion exchange occurs in a thin layer near the surface of HAp particles fired at 1300°C. After ion exchange, Pb‐Cl‐apatite crystals are created in the strongly acidic region (pH 2).